scholarly journals Design of Reconfigurable Micro fluidic Met surface with Different Semiconductor Alloys

2021 ◽  
Vol 09 (11) ◽  
Author(s):  
A. AlGhamdi ◽  
Keyword(s):  
Microfluidic Channel ◽  
Dielectric Materials ◽  
Semiconductor Alloys ◽  
Frequency Range ◽  
Transmission Characteristics ◽  
Reflection And Transmission ◽  
Semiconductor Alloy ◽  
Tan Δ ◽  
Reflection Characteristics ◽  
Transmission And Reflection

In this work, design of a reconfigurable metasurface using all-dielectric materials is presented. An elliptical all-dielectric microfluidic-based metasurface is designed using Rogers RO3210 substrate (ε = 10.2 and tan δ = 0.03). The substrate is covered with microfluidic channel which is filled with five various AgTiTe2, Cu2S, Te.5 Se.5, CuTSe2 and Cu3SbSe4. semiconductor alloys. The reflection and transmission characteristics of the designed metasurface are analyzed in the frequency range of 20-30 GHz using COMSOL Multiphysics software. The results demonstrate that change in the semiconductor alloy in the microfluidic channel various the dynamic transmission and reflection characteristics of the metasurface and thus depicts a reconfigurable operation of the proposed design.

scholarly journals Free-Space Materials Characterization by Reflection and Transmission Measurements using Frequency-by-Frequency and Multi-Frequency Algorithms

Electronics ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 260 ◽  
Author(s):  
Fábio Gonçalves ◽  
Alfred Pinto ◽  
Renato Mesquita ◽  
Elson Silva ◽  
Adriana Brancaccio
Keyword(s):  
Time Domain ◽  
Free Space ◽  
Dielectric Materials ◽  
Weighting Factor ◽  
Reflection And Transmission ◽  
Favorable Configuration ◽  
The Time Domain ◽  
Transmission And Reflection

The knowledge of the electromagnetic constitutive properties of materials is crucial in many applications. Free-space methods are widely used for this purpose, despite their inherent practical difficulties. This paper describes an affordable free-space experimental setup for the characterization of flat samples in 1–6 GHz in a non-anechoic environment. The extracted properties are obtained from the calibrated Scattering Parameters, using a frequency-by-frequency solution or a multi-frequency reconstruction. For the first, we describe how the Time-Domain Gating can be implemented and used for filtering the signals. For the latter, a weighting factor is introduced to balance the reflection and transmission data, allowing one to have a more favorable configuration. The different role of transmission and reflection measurements on the achievable results is analyzed with regard to experimental uncertainties and different noise scenarios. Results from the two strategies are analyzed and compared. Good agreement between simulation, measurement and literature is obtained. According to the reported results for dielectric materials, there is no need of filtering the data by a Time-Domain Gating in case of the multi-frequency approach. Experimental results for Polymethylmethacrylate (PMMA) and Polytetrafluorethylene (PTFE) samples validate both the setup and the processing.

scholarly journals Laser-Scribed Lossy Microstrip Lines for Radio Frequency Applications

2019 ◽  
Vol 9 (3) ◽  
pp. 415 ◽  
Author(s):  
Ruozhou Li ◽  
Jing Yan ◽  
Yuming Fang ◽  
Xingye Fan ◽  
Linkun Sheng ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Flexible Electronics ◽  
Silver Nanostructures ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Transmission Characteristics ◽  
Microstrip Lines ◽  
Reflection Characteristics ◽  
Flexible Radio ◽  
Transmission And Reflection

Laser-direct writing has become an alternative method to fabricate flexible electronics, whereas the resistive nature of laser-scribed conductors may distort the radio-frequency characteristics of circuits for high-frequency applications. We demonstrate that the transmission characteristics of microstrip lines are insensitive to the resistance of laser-scripted conductors when the sheet resistance is not above 0.32 Ω/□. On the other hand, the transmission and reflection characteristics of the MS lines can be simply modified through the accommodation of the resistance of the conductors, because a laser can trigger the sintering and melting of laser produced silver nanostructures. This could provide an alternative way to fabricate radio frequency (RF) resistors and promote their applications to flexible radio-frequency devices and systems.

The Effect of Bends on the Propagation of Guided Waves in Pipes

2005 ◽  
Vol 127 (3) ◽  
pp. 328-335 ◽  
Author(s):  
A. Demma ◽  
P. Cawley ◽  
M. Lowe ◽  
B. Pavlakovic
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Analytical Solution ◽  
Guided Waves ◽  
Ultrasonic Guided Waves ◽  
Pipe Network ◽  
Transmission Characteristics ◽  
Reflection And Transmission ◽  
Factors Affecting ◽  
Transmission And Reflection

The practical testing of pipes in a pipe network has shown that there are issues concerning the propagation of ultrasonic guided waves through bends. It is therefore desirable to improve the understanding of the reflection and transmission characteristics of the bend. First, the dispersion curves for toroidal structures have been calculated using a finite element method, as there is no available analytical solution. Then the factors affecting the transmission and reflection behavior have been identified by studying a straight-curved-straight structure both numerically and experimentally. The frequency dependent transmission behavior obtained is explained in terms of the modes propagating in the straight and curved sections of the pipe.

Transmission and reflection characteristics of normal incidence on silicon-metal-silicon interface

2020 ◽  
Vol 34 (13) ◽  
pp. 2050135
Author(s):  
Xu Sun ◽  
Pengfei Zhu ◽  
Yunxia Ping ◽  
Kun Zhu ◽  
Chaomin Zhang ◽  
...  
Keyword(s):  
Normal Incidence ◽  
Waveguide Structure ◽  
Frequency Range ◽  
Potential Applications ◽  
Broadband Pulse ◽  
Two Peaks ◽  
Silicon Interface ◽  
First Time ◽  
Reflection Characteristics ◽  
Transmission And Reflection

We investigate transmission and reflection properties of a broadband pulse with normal incidence on silicon-metal-silicon (SMS) for the first time, to the best of our knowledge. The results show that in lower frequency range, the transmission is close to zero, and the reflection and loss are in the range 0.50–0.90, 0.10 to 0.50, respectively. In higher frequency range, the transmission spectrum has two peaks, with transmittance 0.69, 0.90, and at same frequencies as the transmission peaks, the reflection spectrum has two troughs with reflectance 0.00, 0.02 and corresponding losses are 0.10, 0.29, respectively. This simple waveguide structure may have potential applications in silicon photonics, such as filters and laser oscillation cavities.

An Experimental Study of the Reflection and Transmission of Flexural Waves at Discontinuities

1985 ◽  
Vol 52 (3) ◽  
pp. 669-673 ◽  
Author(s):  
J. F. Doyle ◽  
S. Kamle
Keyword(s):  
Experimental Study ◽  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Incident Wave ◽  
Experimental Results ◽  
Flexural Waves ◽  
Reflection And Transmission ◽  
Stepped Beam ◽  
Reflection Characteristics ◽  
Transmission And Reflection

The research reported is the study of the transmission and reflection characteristics of flexural waves at structural discontinuities. A Fast Fourier Transform (FFT) computer algorithm is used to characterize the dispersive flexural waves. The incident wave is propagated through two types of discontinuities namely, a stepped beam and the free end of a beam. At each stage, comparison with experimental results are made.

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